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III.F.4. (XVIII.D.1.)

Negative orbital occupation numbers

A negative orbital occupation number indicates that the electronic ground state may not be well represented by a single electronic configuration.

Results for SCl (sulfur monochloride)

The following table lists the minimum orbital occupation numbers


Methods with standard basis sets
3-21G 6-31G* cc-pVTZ aug-cc-pVTZ
Moller Plesset perturbation MP2FC -0.03558 0.00011 0.00002 0.00000
MP2FU   0.00027    
Coupled Cluster CCD   0.00013    

The following table lists the T1 diagnostic


Methods with standard basis sets
6-31G*
Coupled Cluster CCSD 0.01689